package drds.configuration.mvc.util;

import javax.servlet.http.HttpServletRequest;

public class WebInfo {


    /**
     * 果通过了多级反向代理的话，X-Forwarded-For的值并不止一个，而是一串IP值，究竟哪个才是真正的用户端的真实IP呢？
     * <p>
     * 　　答案是取X-Forwarded-For中第一个非unknown的有效IP字符串。如：
     * X-Forwarded-For：192.168.1.110, 192.168.1.120, 192.168.1.130,
     * 192.168.1.100 用户真实IP为： 192.168.1.110
     */
    public static String getRemoteAddrIp(HttpServletRequest request) {
        if (request == null) {
            return "request is null";
        }
        String ip = request.getHeader("x-forwarded-for");
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getHeader("Proxy-Client-IP");
        }
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getHeader("WL-Proxy-Client-IP");
        }
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getRemoteAddr();
        }
        return ip;
    }

    /**
     * 访问的地址
     */
    public static String getVistiedInfo(HttpServletRequest request) {
        if (request == null) {
            return "request is null";
        }
        String url = request.getServletPath();
        String query_string = request.getQueryString();
        String referer = request.getHeader("Referer");
        return "url:" + url + "query_string" + query_string + "referer" + referer + "from ip:" + WebInfo
                .getRemoteAddrIp(request);
    }


}
